Welt-knife.



PATBNTED JULY 7, 1903.

H. KARPENSTEIN.

WELT KNIFE.

APPLICATION FILED IAB. 9, 1903.

H0 MODEL.

WITNESSES/ A TTORNE YS.

UNITED STATES Fatented July 7,

' PATENT OFFICE.

WELT KNIFE.

SEECIFICATION' forming part of Letters Patent No. 733,214, dated July1903;.

Application filed March 9,1903. Serial No.l46,92'7. (No model.)

To all whom, it may concern:

Be it known that I, HENRY KARPENSTEIN, a citizen of the United States,and a resident of the city of New York, borough of Brooklyn, in thecounty of Kings and State of New York, have invented new and usefulImprovements in XVelt-Knives, of which the following is a full, clear,and exact description.

My invention relates to improvements in leather-knives designed for useby shoemakers in cutting the welts of boots or shoes, although it may beused generally in the art of leather-cutting.

The object that I have in view is to provide an improved knife whichembodies means for regulating the depth that the blade may cut into theleather, thus placing the knife more thoroughly under the control of theoperator and preventing said knife from injuring the leather or thearticle by accidental slipping of the tool.

Further objects and advantages of the invention will appear in thecourse of the subjoined description, and the novelty will be defined bythe annexed claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure l is a perspective view illustrating one method of using theimproved knife. Fi g. is an enlarged view, in side elevation, of theknife-head equipped with an improved gage of my invention; and Fig. 3 isa vertical section taken in the plane of the dotted line 3 3 of Fig.

A designates a handle of any suitable construction, and B is aknife-head fastened in a secure wayto the handle. This knife-head isprovided with an active lower edge I), from which extends a lip b, andin one face of the knife-head is formed a recess or socket 0, adapted toreceive a knife or blade 0, the latter being provided with a radialcutting edge (Z, which extends alongside the lip Z) of the knife-head.The cutter or blade 0 is clamped securely in the recess of theknife-head by a headed screw D, which is screwed into a threaded socket(Z in the knife-head; The edge (Z of the knife-head is formed byremoving a portion of the head at the other edge thereof, therebyforming the shoulder b, as shown more clearly by Fig. 2.

The important feature of my invention resides in a gage which is appliedto the knifehead on the opposite side from the cutter C and has a memberthereof disposed in advance of the shoulder or edge I). This gage isindicated in its entirety by the letter E,

and it consists of a plate 6 and a shank c, said plate being arranged atright angles to the shank and made in one piece therewith. The bladeexceeds the width of the shank, and it is curved longitudinally toconform to the curvature of the shoulder or edge Z), as shown by Fig. 2.The shank e rests firmly against one side of the knife-head B, and saidshank has a longitudinal slot f. Over the slotted part of the shank isfitted a washer g, and through said washer and the slotted shank passesa headed clamping-screw F, the latter being screwed into a threadedopening f, which is provided in the knife-head at one side of theopening (1, which receives the clamping-screw D of the blade 0. Theshank of the gage is clamped adjustably to the knife-head, and theinwardly-extending plate 6 of the gage may thus be secured in parallelthe work the edge will cut the leather to the depth regulated by theplate 6 of the gage. It is evident that the position of the gage on theknife-head may be changed to regulate the depth of the cut made by theblade, and the gage may be held so firmly in place on the knife-headthat it cannot be displaced by pressure applied to the tool.

It will be observed that the gage is simple in construction and cheap ofmanufacture, because it is made from a single piece of metal, and thisgage is clamped on the knife-head independently of the attachment of theblade G thereto, thus making provision for the in dependent adjustmentof the gage and blade.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. A welt-cutting knife comprising a head having ashoulder and a lip which lies at an angle to said shoulder, a knifefastened to the head and provided with a radial cutting edge disposedadjacent to the lip, anda gage having a face-plate and a shank, saidshank being secured to the head and the gageplate being presentededgewise to the lip and the radial cutting edge; said gage-plate beingpresented in opposing relation to the shoulder and adjustable laterallyto variable positions relatively thereto.

2. In a welt-cutting knife, a gage consisting of a plate and a shank,said shank lying in a plane substantially at right angles to the plateand formedwith a longitudinally-curved riding face on its outer side.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HENRY KARPENSTEIY. [L. s.]

Witnesses:

L. (J. THOMPSON, LOUIS SOHAFFNER.

